ui/ncurses: Reset console options on boot

[petitboot] / ui / ncurses / nc-cui.c

/*
 *  Copyright (C) 2009 Sony Computer Entertainment Inc.
 *  Copyright 2009 Sony Corp.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; version 2 of the License.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#if defined(HAVE_CONFIG_H)
#include "config.h"
#endif

#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <locale.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/reboot.h>

#include "log/log.h"
#include "pb-protocol/pb-protocol.h"
#include "talloc/talloc.h"
#include "waiter/waiter.h"
#include "process/process.h"
#include "i18n/i18n.h"
#include "ui/common/discover-client.h"
#include "ui/common/ui-system.h"
#include "nc-cui.h"
#include "nc-boot-editor.h"
#include "nc-config.h"
#include "nc-add-url.h"
#include "nc-sysinfo.h"
#include "nc-lang.h"
#include "nc-helpscreen.h"
#include "nc-statuslog.h"
#include "nc-subset.h"
#include "nc-plugin.h"
#include "console-codes.h"

extern const struct help_text main_menu_help_text;
extern const struct help_text plugin_menu_help_text;

static bool cui_detached = false;

static struct pmenu *main_menu_init(struct cui *cui);
static struct pmenu *plugin_menu_init(struct cui *cui);

static void cui_cancel_autoboot_on_exit(struct cui *cui);

static struct {
        int key;
        struct autoboot_option opt;
} autoboot_override_keys[] = {
        { KEY_F(10), {
                        .boot_type = BOOT_DEVICE_TYPE,
                        .type = DEVICE_TYPE_DISK,
                },
        },
        { KEY_F(11), {
                        .boot_type = BOOT_DEVICE_TYPE,
                        .type = DEVICE_TYPE_USB,
                },
        },
        { KEY_F(12), {
                        .boot_type = BOOT_DEVICE_TYPE,
                        .type = DEVICE_TYPE_NETWORK,
                },
        },
};

static bool lockdown_active(void)
{
#if defined(SIGNED_BOOT) && defined(HARD_LOCKDOWN)
        return true;
#else
        bool lockdown = false;
        if (access(LOCKDOWN_FILE, F_OK) != -1)
                lockdown = true;
        return lockdown;
#endif
}

static void cui_set_curses_options(bool curses_mode)
{
        if (curses_mode) {
                cbreak();                       /* Disable line buffering. */
                noecho();                       /* Disable getch() echo. */
                nonl();                         /* Disable new-line translation. */
                intrflush(stdscr, FALSE);       /* Disable interrupt flush. */
                curs_set(0);                    /* Make cursor invisible */
                nodelay(stdscr, TRUE);          /* Enable non-blocking getch() */
        } else {
                nocbreak();                     /* Enable line buffering. */
                echo();                         /* Enable getch() echo. */
                nl();                           /* Enable new-line translation. */
                intrflush(stdscr, TRUE);        /* Enable interrupt flush. */
                curs_set(1);                    /* Make cursor visible */
                nodelay(stdscr, FALSE);         /* Disable non-blocking getch() */
        }
}

static void cui_start(void)
{
        initscr();                      /* Initialize ncurses. */
        keypad(stdscr, TRUE);           /* Enable num keypad keys. */
        cui_set_curses_options(true);

        /* We may be operating with an incorrect $TERM type; in this case
         * the keymappings will be slightly broken. We want at least
         * backspace to work though, so we'll define both DEL and ^H to
         * map to backspace */
        define_key("\x7f", KEY_BACKSPACE);
        define_key("\x08", KEY_BACKSPACE);

        /* we need backtab too, for form navigation. vt220 doesn't include
         * this (kcbt), but we don't want to require a full linux/xterm termcap
         */
        define_key("\x1b[Z", KEY_BTAB);

        /* We'll define a few other keys too since they're commonly
         * used for navigation but the escape character will cause
         * Petitboot to exit if they're left undefined */
        define_key("\x1b\x5b\x35\x7e", KEY_PPAGE);
        define_key("\x1b\x5b\x36\x7e", KEY_NPAGE);
        define_key("\x1b\x5b\x31\x7e", KEY_HOME);
        define_key("\x1b\x5b\x34\x7e", KEY_END);
        define_key("\x1b\x4f\x48", KEY_HOME);
        define_key("\x1b\x4f\x46", KEY_END);
        define_key("OH", KEY_HOME);
        define_key("OF", KEY_END);

        /* Arrow keys in normal cursor mode */
        define_key("\x1b\x5b\x41", KEY_UP);
        define_key("\x1b\x5b\x42", KEY_DOWN);
        define_key("\x1b\x5b\x43", KEY_RIGHT);
        define_key("\x1b\x5b\x44", KEY_LEFT);
        /* Arrow keys in "application" cursor mode */
        define_key("\x1b\x4f\x41", KEY_UP);
        define_key("\x1b\x4f\x42", KEY_DOWN);
        define_key("\x1b\x4f\x43", KEY_RIGHT);
        define_key("\x1b\x4f\x44", KEY_LEFT);

        define_key("\x1b\x5b\x33\x7e", KEY_DC);

        while (getch() != ERR)          /* flush stdin */
                (void)0;
}

static void cui_atexit(void)
{
        if (cui_detached)
                return;

        clear();
        refresh();
        endwin();

        bool lockdown = lockdown_active();

        while (lockdown) {
                sync();
                reboot(RB_AUTOBOOT);
        }
}

/**
 * cui_abort - Signal the main cui program loop to exit.
 *
 * Sets cui.abort, which causes the cui_run() routine to return.
 */

void cui_abort(struct cui *cui)
{
        pb_log_fn("exiting\n");
        cui->abort = 1;
}

/**
 * cui_resize - Signal the main cui program loop to resize
 *
 * Called at SIGWINCH.
 */

void cui_resize(struct cui *cui)
{
        pb_debug("%s: resizing\n", __func__);
        cui->resize = 1;
}

/**
 * cui_on_exit - A generic main menu exit callback.
 */

void cui_on_exit(struct pmenu *menu)
{
        struct cui *cui = cui_from_pmenu(menu);
        char *sh_cmd;

        cui_cancel_autoboot_on_exit(cui);

        sh_cmd = talloc_asprintf(cui,
                "echo \"Exiting petitboot. Type 'exit' to return.\";\
                 echo \"You may run 'pb-sos' to gather diagnostic data\";\
                 %s", pb_system_apps.sh);

        if (!sh_cmd) {
                pb_log("Failed to allocate shell arguments\n");
                return;
        }

        const char *argv[] = {
                pb_system_apps.sh,
                "-c",
                sh_cmd,
                NULL
        };

        cui_run_cmd(cui, argv);

        nc_scr_status_printf(cui->current, _("Returned from shell"));
        talloc_free(sh_cmd);
}

/**
 * cui_abort_on_exit - Force an exit of the main loop on menu exit.
 *                     This is mainly for lockdown situations where
 *                     the exit then triggers an expected reboot.
 */
void cui_abort_on_exit(struct pmenu *menu)
{
        struct cui *cui = cui_from_pmenu(menu);
        cui->abort = 1;
}

/**
 * cui_run_cmd - A generic cb to run the supplied command.
 */

int cui_run_cmd(struct cui *cui, const char **cmd_argv)
{
        struct process *process;
        int result;

        process = process_create(cui);
        if (!process)
                return -1;

        process->path = cmd_argv[0];
        process->argv = cmd_argv;
        process->raw_stdout = true;

        nc_scr_status_printf(cui->current, _("Running %s..."), cmd_argv[0]);

        nc_scr_unpost(cui->current);
        clear();
        refresh();

        def_prog_mode();
        endwin();

        result = process_run_sync(process);

        reset_prog_mode();
        refresh();

        redrawwin(cui->current->main_ncw);
        nc_scr_post(cui->current);

        if (result) {
                pb_log_fn("failed: '%s'\n", cmd_argv[0]);
                nc_scr_status_printf(cui->current, _("Failed: %s"),
                                cmd_argv[0]);
        }

        process_release(process);

        return result;
}

int cui_run_cmd_from_item(struct pmenu_item *item)
{
        struct cui *cui = cui_from_item(item);
        const char **cmd_argv = item->data;

        return cui_run_cmd(cui, cmd_argv);
}

/**
 * cui_boot - A generic cb to run kexec.
 */

static int cui_boot(struct pmenu_item *item)
{
        int result;
        struct cui *cui = cui_from_item(item);
        struct cui_opt_data *cod = cod_from_item(item);

        assert(cui->current == &cui->main->scr);

        pb_debug("%s: %s\n", __func__, cod->name);

        nc_scr_status_printf(cui->current, _("Booting %s..."), cod->name);

        result = discover_client_boot(cui->client, NULL, cod->opt, cod->bd);

        if (result) {
                nc_scr_status_printf(cui->current,
                                _("Failed: boot %s"), cod->bd->image);
        }

        return 0;
}

static void cui_boot_editor_on_exit(struct cui *cui,
                struct pmenu_item *item,
                struct pb_boot_data *bd)
{
        struct pmenu *menu = cui->main;
        struct cui_opt_data *cod;
        int idx, top, rows, cols;
        static int user_idx = 0;

        /* Was the edit cancelled? */
        if (!bd) {
                cui_set_current(cui, &cui->main->scr);
                talloc_free(cui->boot_editor);
                cui->boot_editor = NULL;
                return;
        }

        /* Is this was a new item, we'll need to update the menu */
        if (!item) {
                int insert_pt;

                cod = talloc_zero(NULL, struct cui_opt_data);
                cod->name = talloc_asprintf(cod, _("User item %u"), ++user_idx);

                item = pmenu_item_create(menu, cod->name);
                if (!item) {
                        talloc_free(cod);
                        goto out;
                }

                item->on_edit = cui_item_edit;
                item->on_execute = cui_boot;
                item->data = cod;

                talloc_steal(item, cod);

                /* Detach the items array. */
                set_menu_items(menu->ncm, NULL);

                /* Insert new item at insert_pt. */
                insert_pt = pmenu_grow(menu, 1);
                pmenu_item_insert(menu, item, insert_pt);

                /* Re-attach the items array. */
                set_menu_items(menu->ncm, menu->items);

                /* If our index is above the current top row, align
                 * us to the new top. Otherwise, align us to the new
                 * bottom */
                menu_format(cui->main->ncm, &rows, &cols);
                top = top_row(cui->main->ncm);
                idx = item_index(item->nci);

                if (top >= idx)
                        top = idx;
                else
                        top = idx < rows ? 0 : idx - rows + 1;

                set_top_row(cui->main->ncm, top);
                set_current_item(item->pmenu->ncm, item->nci);

                nc_scr_post(&menu->scr);
        } else {
                cod = item->data;
        }

        cod->bd = talloc_steal(cod, bd);

out:
        cui_set_current(cui, &cui->main->scr);
        talloc_free(cui->boot_editor);
        cui->boot_editor = NULL;
}

void cui_item_edit(struct pmenu_item *item)
{
        struct cui *cui = cui_from_item(item);
        cui->boot_editor = boot_editor_init(cui, item, cui->sysinfo,
                                        cui_boot_editor_on_exit);
        cui_set_current(cui, boot_editor_scr(cui->boot_editor));
}

void cui_item_new(struct pmenu *menu)
{
        struct cui *cui = cui_from_pmenu(menu);
        cui->boot_editor = boot_editor_init(cui, NULL, cui->sysinfo,
                                        cui_boot_editor_on_exit);
        cui_set_current(cui, boot_editor_scr(cui->boot_editor));
}

static void cui_sysinfo_exit(struct cui *cui)
{
        cui_set_current(cui, &cui->main->scr);
        talloc_free(cui->sysinfo_screen);
        cui->sysinfo_screen = NULL;
}

void cui_show_sysinfo(struct cui *cui)
{
        cui->sysinfo_screen = sysinfo_screen_init(cui, cui->sysinfo,
                        cui_sysinfo_exit);
        cui_set_current(cui, sysinfo_screen_scr(cui->sysinfo_screen));
}

static void cui_config_exit(struct cui *cui)
{
        cui_set_current(cui, &cui->main->scr);
        talloc_free(cui->config_screen);
        cui->config_screen = NULL;
}

void cui_show_config(struct cui *cui)
{
        cui->config_screen = config_screen_init(cui, cui->config,
                        cui->sysinfo, cui_config_exit);
        cui_set_current(cui, config_screen_scr(cui->config_screen));
}

static void cui_lang_exit(struct cui *cui)
{
        cui_set_current(cui, &cui->main->scr);
        talloc_free(cui->lang_screen);
        cui->lang_screen = NULL;
}

void cui_show_lang(struct cui *cui)
{
        cui->lang_screen = lang_screen_init(cui, cui->config, cui_lang_exit);
        cui_set_current(cui, lang_screen_scr(cui->lang_screen));
}

static void cui_statuslog_exit(struct cui *cui)
{
        cui_set_current(cui, &cui->main->scr);
        talloc_free(cui->statuslog_screen);
        cui->statuslog_screen = NULL;
}

void cui_show_statuslog(struct cui *cui)
{
        cui->statuslog_screen = statuslog_screen_init(cui, cui_statuslog_exit);
        cui_set_current(cui, statuslog_screen_scr(cui->statuslog_screen));
}

static void cui_add_url_exit(struct cui *cui)
{
        cui_set_current(cui, &cui->main->scr);
        talloc_free(cui->add_url_screen);
        cui->add_url_screen = NULL;
}

static void cui_plugin_exit(struct cui *cui)
{
        cui_set_current(cui, &cui->plugin_menu->scr);
        talloc_free(cui->plugin_screen);
        cui->plugin_screen = NULL;
}

static void cui_plugin_menu_exit(struct pmenu *menu)
{
        struct cui *cui = cui_from_pmenu(menu);
        cui_set_current(cui, &cui->main->scr);
}

void cui_show_add_url(struct cui *cui)
{
        cui->add_url_screen = add_url_screen_init(cui, cui_add_url_exit);
        cui_set_current(cui, add_url_screen_scr(cui->add_url_screen));
}

void cui_show_plugin_menu(struct cui *cui)
{
        cui_set_current(cui, &cui->plugin_menu->scr);
}

void cui_show_plugin(struct pmenu_item *item)
{
        struct cui *cui = cui_from_item(item);
        cui->plugin_screen = plugin_screen_init(cui, item, cui_plugin_exit);
        cui_set_current(cui, plugin_screen_scr(cui->plugin_screen));
}

static void cui_help_exit(struct cui *cui)
{
        cui_set_current(cui, help_screen_return_scr(cui->help_screen));
        talloc_free(cui->help_screen);
        cui->help_screen = NULL;
}

void cui_show_help(struct cui *cui, const char *title,
                const struct help_text *text)
{
        if (!cui->current)
                return;

        if (cui->help_screen)
                return;

        cui->help_screen = help_screen_init(cui, cui->current,
                        title, text, cui_help_exit);

        if (cui->help_screen)
                cui_set_current(cui, help_screen_scr(cui->help_screen));
}

static void cui_subset_exit(struct cui *cui)
{
        cui_set_current(cui, subset_screen_return_scr(cui->subset_screen));
        talloc_free(cui->subset_screen);
        cui->subset_screen = NULL;
}

void cui_show_subset(struct cui *cui, const char *title,
                     void *arg)
{
        if (!cui->current)
                return;

        if (cui->subset_screen)
                return;

        cui->subset_screen = subset_screen_init(cui, cui->current,
                        title, arg, cui_subset_exit);

        if (cui->subset_screen)
                cui_set_current(cui, subset_screen_scr(cui->subset_screen));
}

/**
 * cui_set_current - Set the currently active screen and redraw it.
 */

struct nc_scr *cui_set_current(struct cui *cui, struct nc_scr *scr)
{
        struct nc_scr *old;

        DBGS("%p -> %p\n", cui->current, scr);

        assert(cui->current != scr);

        old = cui->current;
        nc_scr_unpost(old);

        cui->current = scr;

        nc_scr_post(cui->current);

        return old;
}

static bool set_temp_autoboot_opt(struct cui *cui, struct autoboot_option *opt)
{
        cui->autoboot_opt = opt;
        if (cui->client)
                discover_client_send_temp_autoboot(cui->client, opt);

        return true;
}

static bool key_cancels_boot(int key)
{
        unsigned int i;

        if (key == 0xc)
                return false;

        for (i = 0; i < ARRAY_SIZE(autoboot_override_keys); i++)
                if (key == autoboot_override_keys[i].key)
                        return false;

        return true;
}

static bool process_global_keys(struct cui *cui, int key)
{
        unsigned int i;

        switch (key) {
        case 0xc:
                if (cui->current && cui->current->main_ncw)
                        wrefresh(curscr);
                return true;
        }

        /* check for autoboot override keys */
        for (i = 0; i < ARRAY_SIZE(autoboot_override_keys); i++) {
                if (key != autoboot_override_keys[i].key)
                        continue;

                pb_log("Sending temporary autoboot override\n");
                set_temp_autoboot_opt(cui, &autoboot_override_keys[i].opt);
                return true;
        }

        return false;
}

/**
 * cui_process_key - Process input on stdin.
 */

static int cui_process_key(void *arg)
{
        struct cui *cui = cui_from_arg(arg);
        unsigned int i;
        char *sequence;
        int grab;

        assert(cui->current);

        for (;;) {
                int c = getch();

                pb_debug("%s: got key %d\n", __func__, c);

                if (c == ERR)
                        break;

                if (c == 27) {
                        /*
                         * If this is a console code sequence try to parse it
                         * and don't treat this as a key press.
                         */
                        grab = getch();
                        if (grab != ERR && grab != 27) {
                                ungetch(grab);
                                pb_debug("%s: Caught unhandled command sequence\n",
                                                __func__);
                                sequence = handle_control_sequence(cui, c);
                                pb_debug("Caught sequence ");
                                if (sequence) {
                                        pb_debug("(%zu): ", strlen(sequence));
                                        for (i = 0; i < strlen(sequence); i++)
                                                pb_debug("0%o ", sequence[i]);
                                        pb_debug("\n");
                                } else
                                        pb_debug("(0): (none)\n");
                                continue;
                        }
                }

                if (cui->preboot_mode) {
                        /* Turn curses options back on if the user interacts */
                        cui->preboot_mode = false;
                        cui_set_curses_options(true);
                }

                if (!cui->has_input && key_cancels_boot(c)) {
                        cui->has_input = true;
                        if (cui->client) {
                                pb_log("UI input received (key = %d), aborting "
                                        "default boot\n", c);
                                discover_client_cancel_default(cui->client);
                        } else {
                                pb_log("UI input received (key = %d), aborting "
                                        "once server connects\n", c);
                        }
                }

                if (process_global_keys(cui, c))
                        continue;

                cui->current->process_key(cui->current, c);
        }

        return 0;
}

/**
 * cui_process_js - Process joystick events.
 */

static int cui_process_js(void *arg)
{
        struct cui *cui = cui_from_arg(arg);
        int c;

        c = pjs_process_event(cui->pjs);

        if (c) {
                ungetch(c);
                cui_process_key(arg);
        }

        return 0;
}

/**
 * cui_handle_resize - Handle the term resize.
 */

static void cui_handle_resize(struct cui *cui)
{
        struct winsize ws;

        if (ioctl(1, TIOCGWINSZ, &ws) == -1) {
                pb_log_fn("ioctl failed: %s\n", strerror(errno));
                return;
        }

        pb_debug("%s: {%u,%u}\n", __func__, ws.ws_row, ws.ws_col);

        wclear(cui->current->main_ncw);
        resize_term(ws.ws_row, ws.ws_col);
        cui->current->resize(cui->current);

        /* For some reason this makes ncurses redraw the screen */
        getch();
        redrawwin(cui->current->main_ncw);
        wrefresh(cui->current->main_ncw);
}

/**
 * cui_device_add - Client device_add callback.
 *
 * Creates menu_items for all the device boot_options and inserts those
 * menu_items into the main menu.  Redraws the main menu if it is active.
 * If a 'plugin' type boot_option appears the plugin menu is updated instead.
 */

static int cui_boot_option_add(struct device *dev, struct boot_option *opt,
                void *arg)
{
        struct pmenu_item *i, *dev_hdr = NULL;
        struct cui *cui = cui_from_arg(arg);
        struct cui_opt_data *cod;
        const char *tab = "  ";
        unsigned int insert_pt;
        int result, rows, cols;
        struct pmenu *menu;
        bool plugin_option;
        ITEM *selected;
        char *name;

        plugin_option = opt->type == DISCOVER_PLUGIN_OPTION;
        menu = plugin_option ? cui->plugin_menu : cui->main;

        pb_debug("%s: %p %s\n", __func__, opt, opt->id);

        selected = current_item(menu->ncm);
        menu_format(menu->ncm, &rows, &cols);

        if (cui->current == &cui->main->scr)
                nc_scr_unpost(cui->current);
        if (plugin_option && cui->current == &cui->plugin_menu->scr)
                nc_scr_unpost(cui->current);

        /* Check if the boot device is new */
        dev_hdr = pmenu_find_device(menu, dev, opt);

        /* All actual boot entries are 'tabbed' across */
        name = talloc_asprintf(menu, "%s%s",
                        tab, opt->name ? : "Unknown Name");

        /* Save the item in opt->ui_info for cui_device_remove() */
        opt->ui_info = i = pmenu_item_create(menu, name);
        talloc_free(name);
        if (!i)
                return -1;

        if (plugin_option) {
                i->on_edit = NULL;
                i->on_execute = plugin_install_plugin;
        } else {
                i->on_edit = cui_item_edit;
                i->on_execute = cui_boot;
        }

        i->data = cod = talloc(i, struct cui_opt_data);
        cod->opt = opt;
        cod->dev = dev;
        cod->opt_hash = pb_opt_hash(dev, opt);
        cod->name = opt->name;

        if (plugin_option) {
                cod->pd = talloc(i, struct pb_plugin_data);
                cod->pd->plugin_file = talloc_strdup(cod,
                                opt->boot_image_file);
        } else {
                cod->bd = talloc(i, struct pb_boot_data);
                cod->bd->image = talloc_strdup(cod->bd, opt->boot_image_file);
                cod->bd->initrd = talloc_strdup(cod->bd, opt->initrd_file);
                cod->bd->dtb = talloc_strdup(cod->bd, opt->dtb_file);
                cod->bd->args = talloc_strdup(cod->bd, opt->boot_args);
                cod->bd->args_sig_file = talloc_strdup(cod->bd, opt->args_sig_file);
        }

        /* This disconnects items array from menu. */
        result = set_menu_items(menu->ncm, NULL);

        if (result)
                pb_log_fn("set_menu_items failed: %d\n", result);

        /* Insert new items at insert_pt. */
        if (dev_hdr) {
                insert_pt = pmenu_grow(menu, 2);
                pmenu_item_insert(menu, dev_hdr, insert_pt);
                pb_log("%s: adding new device hierarchy %s\n",
                        __func__, opt->device_id);
                pmenu_item_insert(menu, i, insert_pt+1);
        } else {
                insert_pt = pmenu_grow(menu, 1);
                pmenu_item_add(menu, i, insert_pt);
        }

        if (plugin_option) {
                pb_log_fn("adding plugin '%s'\n", cod->name);
                pb_log("   file  '%s'\n", cod->pd->plugin_file);
        } else {
                pb_log_fn("adding opt '%s'\n", cod->name);
                pb_log("   image  '%s'\n", cod->bd->image);
                pb_log("   initrd '%s'\n", cod->bd->initrd);
                pb_log("   args   '%s'\n", cod->bd->args);
                pb_log("   argsig '%s'\n", cod->bd->args_sig_file);
        }

        /* Update the plugin menu label if needed */
        if (plugin_option) {
                struct pmenu_item *item;
                unsigned int j;
                result = set_menu_items(cui->main->ncm, NULL);
                for (j = 0 ; j < cui->main->item_count; j++) {
                        item = item_userptr(cui->main->items[j]);
                        if (strncmp(item->nci->name.str, "Plugins", strlen("Plugins")))
                                continue;
                        cui->n_plugins++;
                        char *label = talloc_asprintf(item, "Plugins (%u)",
                                        cui->n_plugins);
                        pmenu_item_update(item, label);
                        talloc_free(label);
                        break;
                }
                result = set_menu_items(cui->main->ncm, cui->main->items);
                if (result)
                        pb_log_fn("set_menu_items failed: %d\n", result);
        }

        /* Re-attach the items array. */
        result = set_menu_items(menu->ncm, menu->items);

        if (result)
                pb_log_fn("set_menu_items failed: %d\n", result);

        if (0) {
                pb_log("%s\n", __func__);
                pmenu_dump_items(menu->items,
                        item_count(menu->ncm) + 1);
        }

        if (!item_visible(selected)) {
                int idx, top;

                top = top_row(menu->ncm);
                idx = item_index(selected);

                /* If our index is above the current top row, align
                 * us to the new top. Otherwise, align us to the new
                 * bottom */
                top = top < idx ? idx - rows + 1 : idx;

                set_top_row(menu->ncm, top);
                set_current_item(menu->ncm, selected);
        }

        if (cui->current == &menu->scr)
                nc_scr_post(cui->current);
        if (plugin_option && cui->current == &cui->main->scr)
                nc_scr_post(cui->current);

        return 0;
}

/**
 * cui_device_remove - Client device remove callback.
 *
 * Removes all the menu_items for the device from the main menu and redraws the
 * main menu if it is active.
 */
static void cui_device_remove(struct device *dev, void *arg)
{
        struct cui *cui = cui_from_arg(arg);
        struct boot_option *opt;
        unsigned int i;
        int rows, cols, top, last;
        int result;

        pb_log_fn("%p %s\n", dev, dev->id);

        if (cui->current == &cui->main->scr)
                nc_scr_unpost(cui->current);
        if (cui->current == &cui->plugin_menu->scr)
                nc_scr_unpost(cui->current);

        /* This disconnects items array from menu. */

        result = set_menu_items(cui->main->ncm, NULL);
        result |= set_menu_items(cui->plugin_menu->ncm, NULL);

        if (result)
                pb_log_fn("set_menu_items failed: %d\n", result);

        list_for_each_entry(&dev->boot_options, opt, list) {
                struct pmenu_item *item = pmenu_item_from_arg(opt->ui_info);

                assert(pb_protocol_device_cmp(dev, cod_from_item(item)->dev));
                if (opt->type == DISCOVER_PLUGIN_OPTION)
                        pmenu_remove(cui->plugin_menu, item);
                else
                        pmenu_remove(cui->main, item);
        }

        /* Manually remove remaining device hierarchy item */
        for (i=0; i < cui->main->item_count; i++) {
                struct pmenu_item *item = item_userptr(cui->main->items[i]);
                if (!item || !item->data )
                        continue;

                struct cui_opt_data *data = item->data;
                if (data && data->dev && data->dev == dev)
                        pmenu_remove(cui->main,item);
        }
        /* Look in plugins menu too */
        for (i=0; i < cui->plugin_menu->item_count; i++) {
                struct pmenu_item *item = item_userptr(cui->plugin_menu->items[i]);
                if (!item || !item->data )
                        continue;

                struct cui_opt_data *data = item->data;
                if (data && data->dev && data->dev == dev)
                        pmenu_remove(cui->plugin_menu,item);
        }

        /* Re-attach the items array. */

        result = set_menu_items(cui->main->ncm, cui->main->items);
        result |= set_menu_items(cui->plugin_menu->ncm, cui->plugin_menu->items);

        /* Move cursor to 'Exit' menu entry for the main menu.. */
        menu_format(cui->main->ncm, &rows, &cols);
        last = cui->main->item_count - 1;
        set_current_item(cui->main->ncm, cui->main->items[last]);
        if (!item_visible(cui->main->items[last])) {
                top = last < rows ? 0 : last - rows + 1;
                set_top_row(cui->main->ncm, top);
        }

        /* ..and the plugin menu */
        menu_format(cui->plugin_menu->ncm, &rows, &cols);
        last = cui->plugin_menu->item_count - 1;
        set_current_item(cui->plugin_menu->ncm, cui->plugin_menu->items[last]);
        if (!item_visible(cui->plugin_menu->items[last])) {
                top = last < rows ? 0 : last - rows + 1;
                set_top_row(cui->plugin_menu->ncm, top);
        }

        if (result)
                pb_log_fn("set_menu_items failed: %d\n", result);

        if (0) {
                pb_log("%s\n", __func__);
                pmenu_dump_items(cui->main->items,
                        item_count(cui->main->ncm) + 1);
        }

        if (cui->current == &cui->main->scr)
                nc_scr_post(cui->current);
        if (cui->current == &cui->plugin_menu->scr)
                nc_scr_post(cui->current);
}

static void cui_update_status(struct status *status, void *arg)
{
        struct cui *cui = cui_from_arg(arg);

        statuslog_append_steal(cui, cui->statuslog, status);

        /* Ignore status messages from the backlog */
        if (status->backlog)
                return;

        nc_scr_status_printf(cui->current, "%s", status->message);

        if (cui->preboot_mode &&
                (!status->boot_active || status->type == STATUS_ERROR)) {
                cui_set_curses_options(true);
                cui->preboot_mode = false;
        } else {
                cui->preboot_mode = status->boot_active &&
                                                status->type == STATUS_INFO;
                if (cui->preboot_mode)
                        cui_set_curses_options(false);
        }
}

/*
 * Handle a new installed plugin option and update its associated
 * (uninstalled) menu item if it exists.
 */
static int cui_plugin_option_add(struct plugin_option *opt, void *arg)
{
        struct cui_opt_data *cod;
        struct cui *cui = cui_from_arg(arg);
        struct pmenu_item *item = NULL;
        struct boot_option *dummy_opt;
        struct device *dev;
        unsigned int i;
        int result;

fallback:
        /* Find uninstalled plugin by matching on plugin_file */
        for (i = 0; i < cui->plugin_menu->item_count; i++) {
                item = item_userptr(cui->plugin_menu->items[i]);
                if (!item)
                        continue;
                cod = cod_from_item(item);
                if (!cod || !cod->pd)
                        continue;
                if (strncmp(cod->pd->plugin_file, opt->plugin_file,
                                        strlen(cod->pd->plugin_file)) == 0)
                        break;
        }

        /*
         * If pb-plugin was run manually there may not be an associated
         * plugin-type boot_option. Pass a fake device and option to
         * cui_boot_option_add() so we have an item to work with.
         */
        if (!item || i >= cui->plugin_menu->item_count) {
                pb_log("New plugin option %s doesn't have a source item\n",
                                opt->id);
                dev = talloc_zero(cui, struct device);
                dev->id = dev->name = talloc_asprintf(dev, "(unknown)");
                dev->type = DEVICE_TYPE_UNKNOWN;
                dummy_opt = talloc_zero(cui, struct boot_option);
                dummy_opt->device_id = talloc_strdup(dummy_opt, dev->id);
                dummy_opt->id = dummy_opt->name = talloc_asprintf(dummy_opt, "dummy");
                dummy_opt->boot_image_file = talloc_strdup(dummy_opt, opt->plugin_file);
                dummy_opt->type = DISCOVER_PLUGIN_OPTION;
                cui_boot_option_add(dev, dummy_opt, cui);
                goto fallback;
        }

        /*
         * If this option was faked above move the context under
         * the item so it is cleaned up later in cui_plugins_remove().
         */
        if (strcmp(cod->opt->id, "dummy") == 0 &&
                        cod->dev->type == DEVICE_TYPE_UNKNOWN) {
                talloc_steal(item, cod->dev);
                talloc_steal(item, cod->opt);
        }

        talloc_free(cod->name);
        /* Name is still tabbed across */
        cod->name = talloc_asprintf(cod, _("  %s [installed]"), opt->name);

        cod->pd->opt = opt;
        item->on_execute = NULL;
        item->on_edit = cui_show_plugin;

        if (cui->current == &cui->plugin_menu->scr)
                nc_scr_unpost(cui->current);

        /* This disconnects items array from menu. */
        result = set_menu_items(cui->plugin_menu->ncm, NULL);

        if (result == E_OK)
                pmenu_item_update(item, cod->name);

        /* Re-attach the items array. */
        result = set_menu_items(cui->plugin_menu->ncm, cui->plugin_menu->items);

        if (cui->current == &cui->plugin_menu->scr)
                nc_scr_post(cui->current);

        return result;
}

/*
 * Most plugin menu items will be removed via cui_device_remove(). However if
 * pb-plugin has been run manually it is possible that there a plugin items
 * not associated with a device - remove them here.
 */
static int cui_plugins_remove(void *arg)
{
        struct cui *cui = cui_from_arg(arg);
        struct pmenu_item *item = NULL;
        struct cui_opt_data *cod;
        unsigned int i = 0;

        pb_debug("%s\n", __func__);

        if (cui->current == &cui->plugin_menu->scr)
                nc_scr_unpost(cui->current);
        if (cui->current == &cui->main->scr)
                nc_scr_unpost(cui->current);

        /* This disconnects items array from menu. */
        set_menu_items(cui->plugin_menu->ncm, NULL);

        while (i < cui->plugin_menu->item_count) {
                item = item_userptr(cui->plugin_menu->items[i]);
                if (!item || !item->data) {
                        i++;
                        continue;
                }
                cod = cod_from_item(item);
                if (!cod->opt && !cod->dev) {
                        i++;
                        continue;
                }

                pmenu_remove(cui->plugin_menu, item);
                /* plugin_menu entries will shift, jump to bottom to make sure
                 * we remove all plugin option items */
                i = 0;
        }

        /* Re-attach the items array. */
        set_menu_items(cui->plugin_menu->ncm, cui->plugin_menu->items);

        set_menu_items(cui->main->ncm, NULL);
        for (i = 0; i < cui->main->item_count; i++) {
                item = item_userptr(cui->main->items[i]);
                if (strncmp(item->nci->name.str, "Plugins", strlen("Plugins")))
                        continue;
                cui->n_plugins = 0;
                pmenu_item_update(item, "Plugins (0)");
                break;
        }

        set_menu_items(cui->main->ncm, cui->main->items);

        if (cui->current == &cui->main->scr)
                nc_scr_post(cui->current);

        /* If we're currently in a plugin screen jump back to the plugin menu */
        if (cui->plugin_screen &&
                        cui->current == plugin_screen_scr(cui->plugin_screen))
                cui_plugin_exit(cui);

        return 0;
}

static void cui_update_mm_title(struct cui *cui)
{
        struct nc_frame *frame = &cui->main->scr.frame;

        talloc_free(frame->rtitle);

        frame->rtitle = talloc_strdup(cui->main, cui->sysinfo->type);
        if (cui->sysinfo->identifier)
                frame->rtitle = talloc_asprintf_append(frame->rtitle,
                                " %s", cui->sysinfo->identifier);

        if (cui->current == &cui->main->scr)
                nc_scr_post(cui->current);

        frame = &cui->plugin_menu->scr.frame;

        talloc_free(frame->rtitle);

        frame->rtitle = talloc_strdup(cui->main, cui->sysinfo->type);
        if (cui->sysinfo->identifier)
                frame->rtitle = talloc_asprintf_append(frame->rtitle,
                                " %s", cui->sysinfo->identifier);

        if (cui->current == &cui->main->scr)
                nc_scr_post(cui->current);
}

static void cui_update_sysinfo(struct system_info *sysinfo, void *arg)
{
        struct cui *cui = cui_from_arg(arg);
        cui->sysinfo = talloc_steal(cui, sysinfo);

        /* if we're currently displaying the system info screen, inform it
         * of the updated information. */
        if (cui->sysinfo_screen)
                sysinfo_screen_update(cui->sysinfo_screen, sysinfo);

        if (cui->subset_screen)
                subset_screen_update(cui->subset_screen);

        /* ... and do the same with the config screen... */
        if (cui->config_screen)
                config_screen_update(cui->config_screen, cui->config, sysinfo);

        /* ... and the boot editor. */
        if (cui->boot_editor)
                boot_editor_update(cui->boot_editor, sysinfo);

        cui_update_mm_title(cui);
}

static void cui_update_language(struct cui *cui, char *lang)
{
        bool repost_menu;
        char *cur_lang;

        cur_lang = setlocale(LC_ALL, NULL);
        if (cur_lang && !strcmp(cur_lang, lang))
                return;

        setlocale(LC_ALL, lang);

        /* we'll need to update the menu: drop all items and repopulate */
        repost_menu = cui->current == &cui->main->scr ||
                cui->current == &cui->plugin_menu->scr;
        if (repost_menu)
                nc_scr_unpost(cui->current);

        talloc_free(cui->main);
        cui->main = main_menu_init(cui);
        cui->plugin_menu = plugin_menu_init(cui);

        if (repost_menu) {
                cui->current = &cui->main->scr;
                nc_scr_post(cui->current);
        }

        discover_client_enumerate(cui->client);
}

static void cui_update_config(struct config *config, void *arg)
{
        struct cui *cui = cui_from_arg(arg);
        cui->config = talloc_steal(cui, config);

        if (config->lang)
                cui_update_language(cui, config->lang);

        if (cui->subset_screen)
                subset_screen_update(cui->subset_screen);

        if (cui->config_screen)
                config_screen_update(cui->config_screen, config, cui->sysinfo);

        if (config->safe_mode)
                nc_scr_status_printf(cui->current,
                                _("SAFE MODE: select '%s' to continue"),
                                _("Rescan devices"));
}

int cui_send_config(struct cui *cui, struct config *config)
{
        return discover_client_send_config(cui->client, config);
}

int cui_send_url(struct cui *cui, char * url)
{
        return discover_client_send_url(cui->client, url);
}

int cui_send_plugin_install(struct cui *cui, char *file)
{
        return discover_client_send_plugin_install(cui->client, file);
}

void cui_send_reinit(struct cui *cui)
{
        discover_client_send_reinit(cui->client);
}

static int menu_sysinfo_execute(struct pmenu_item *item)
{
        cui_show_sysinfo(cui_from_item(item));
        return 0;
}

static int menu_config_execute(struct pmenu_item *item)
{
        cui_show_config(cui_from_item(item));
        return 0;
}

static int menu_lang_execute(struct pmenu_item *item)
{
        cui_show_lang(cui_from_item(item));
        return 0;
}

static int menu_statuslog_execute(struct pmenu_item *item)
{
        cui_show_statuslog(cui_from_item(item));
        return 0;
}

static int menu_reinit_execute(struct pmenu_item *item)
{
        if (cui_from_item(item)->client)
                cui_send_reinit(cui_from_item(item));
        return 0;
}

static int menu_add_url_execute(struct pmenu_item *item)
{
        if (cui_from_item(item)->client)
                cui_show_add_url(cui_from_item(item));
        return 0;
}

static int menu_plugin_execute(struct pmenu_item *item)
{
        if (cui_from_item(item)->client)
                cui_show_plugin_menu(cui_from_item(item));
        return 0;
}

/**
 * pb_mm_init - Setup the main menu instance.
 */
static struct pmenu *main_menu_init(struct cui *cui)
{
        struct pmenu_item *i;
        struct pmenu *m;
        int result;
        bool lockdown = lockdown_active();

        m = pmenu_init(cui, 9, lockdown ? cui_abort_on_exit : cui_on_exit);
        if (!m) {
                pb_log_fn("failed\n");
                return NULL;
        }

        m->n_hot_keys = 1;
        m->hot_keys = talloc_array(m, hot_key_fn, m->n_hot_keys);
        if (!m->hot_keys) {
                pb_log_fn("failed to allocate hot_keys\n");
                talloc_free(m);
                return NULL;
        }
        m->hot_keys[0] = pmenu_main_hot_keys;
        m->on_new = cui_item_new;

        m->scr.frame.ltitle = talloc_asprintf(m,
                "Petitboot (" PACKAGE_VERSION ")");
        m->scr.frame.rtitle = NULL;
        m->scr.frame.help = talloc_strdup(m,
                _("Enter=accept, e=edit, n=new, x=exit, l=language, g=log, h=help"));
        m->scr.frame.status = talloc_strdup(m, _("Welcome to Petitboot"));

        /* add a separator */
        i = pmenu_item_create(m, " ");
        item_opts_off(i->nci, O_SELECTABLE);
        pmenu_item_insert(m, i, 0);

        /* add system items */
        i = pmenu_item_create(m, _("System information"));
        i->on_execute = menu_sysinfo_execute;
        pmenu_item_insert(m, i, 1);

        i = pmenu_item_create(m, _("System configuration"));
        i->on_execute = menu_config_execute;
        pmenu_item_insert(m, i, 2);

        i = pmenu_item_create(m, _("System status log"));
        i->on_execute = menu_statuslog_execute;
        pmenu_item_insert(m, i, 3);

        /* this label isn't translated, so we don't want a gettext() here */
        i = pmenu_item_create(m, "Language");
        i->on_execute = menu_lang_execute;
        pmenu_item_insert(m, i, 4);

        i = pmenu_item_create(m, _("Rescan devices"));
        i->on_execute = menu_reinit_execute;
        pmenu_item_insert(m, i, 5);

        i = pmenu_item_create(m, _("Retrieve config from URL"));
        i->on_execute = menu_add_url_execute;
        pmenu_item_insert(m, i, 6);

        i = pmenu_item_create(m, _("Plugins (0)"));
        i->on_execute = menu_plugin_execute;
        pmenu_item_insert(m, i, 7);

        if (lockdown)
                i = pmenu_item_create(m, _("Reboot"));
        else
                i = pmenu_item_create(m, _("Exit to shell"));
        i->on_execute = pmenu_exit_cb;
        pmenu_item_insert(m, i, 8);

        result = pmenu_setup(m);

        if (result) {
                pb_log("%s:%d: pmenu_setup failed: %s\n", __func__, __LINE__,
                        strerror(errno));
                goto fail_setup;
        }

        m->help_title = _("main menu");
        m->help_text = &main_menu_help_text;

        menu_opts_off(m->ncm, O_SHOWDESC);
        set_menu_mark(m->ncm, " *");
        set_current_item(m->ncm, i->nci);

        return m;

fail_setup:
        talloc_free(m);
        return NULL;
}

/*
 * plugin_menu_init: Set up the plugin menu instance
 */
static struct pmenu *plugin_menu_init(struct cui *cui)
{
        struct pmenu_item *i;
        struct pmenu *m;
        int result;

        m = pmenu_init(cui, 2, cui_plugin_menu_exit);
        m->scr.frame.ltitle = talloc_asprintf(m, _("Petitboot Plugins"));
        m->scr.frame.rtitle = talloc_asprintf(m, "%s", "");
        m->scr.frame.help = talloc_strdup(m,
                _("Enter=install, e=details, x=exit, h=help"));
        m->scr.frame.status = talloc_asprintf(m,
                        _("Available Petitboot Plugins"));

        /* add a separator */
        i = pmenu_item_create(m, " ");
        item_opts_off(i->nci, O_SELECTABLE);
        pmenu_item_insert(m, i, 0);

        i = pmenu_item_create(m, _("Return to Main Menu"));
        i->on_execute = pmenu_exit_cb;
        pmenu_item_insert(m, i, 1);

        result = pmenu_setup(m);

        if (result) {
                pb_log("%s:%d: pmenu_setup failed: %s\n", __func__, __LINE__,
                        strerror(errno));
                goto fail_setup;
        }

        m->help_title = _("plugin menu");
        m->help_text = &plugin_menu_help_text;

        return m;

fail_setup:
        talloc_free(m);
        return NULL;
}

static struct discover_client_ops cui_client_ops = {
        .device_add = NULL,
        .boot_option_add = cui_boot_option_add,
        .device_remove = cui_device_remove,
        .plugin_option_add = cui_plugin_option_add,
        .plugins_remove = cui_plugins_remove,
        .update_status = cui_update_status,
        .update_sysinfo = cui_update_sysinfo,
        .update_config = cui_update_config,
};

/* cui_server_wait - Connect to the discover server.
 * @arg: Pointer to the cui instance.
 *
 * A timeout callback that attempts to connect to the discover server; on
 * failure it registers itself with a one second timeout to try again.
 * On success the cui->client struct will be set.
 *
 * Since this updates the status line when called it must not be called
 * before the UI is ready.
 */
static int cui_server_wait(void *arg)
{
        struct cui *cui = cui_from_arg(arg);

        if (cui->client) {
                pb_debug("We already have a server!\n");
                return 0;
        }

        /* We haven't yet connected to the server */
        pb_log("Trying to connect...\n");
        cui->client = discover_client_init(cui->waitset,
                        &cui_client_ops, cui);

        if (!cui->client) {
                waiter_register_timeout(cui->waitset, 1000, cui_server_wait,
                                        cui);
                nc_scr_status_printf(cui->current,
                                     "Info: Waiting for device discovery");
        } else {
                nc_scr_status_free(cui->current);
                talloc_steal(cui, cui->client);

                if (cui->has_input) {
                        pb_log("Aborting default boot on pb-discover connect\n");
                        discover_client_cancel_default(cui->client);
                }

                if (cui->autoboot_opt) {
                        pb_log("Sending autoboot override on pb-discover connect\n");
                        discover_client_send_temp_autoboot(cui->client,
                                        cui->autoboot_opt);
                }
        }

        return 0;
}

/**
 * cui_init - Setup the cui instance.
 * @platform_info: A value for the struct cui platform_info member.
 *
 * Returns a pointer to a struct cui on success, or NULL on error.
 *
 * Allocates the cui instance, sets up the client and stdin waiters, and
 * sets up the ncurses menu screen.
 */

struct cui *cui_init(void* platform_info,
        int (*js_map)(const struct js_event *e), int start_daemon, int timeout)
{
        struct cui *cui;
        unsigned int i;

        cui = talloc_zero(NULL, struct cui);
        if (!cui) {
                pb_log_fn("alloc cui failed.\n");
                fprintf(stderr, _("%s: alloc cui failed.\n"), __func__);
                goto fail_alloc;
        }

        cui->c_sig = pb_cui_sig;
        cui->platform_info = platform_info;
        cui->waitset = waitset_create(cui);
        cui->statuslog = statuslog_init(cui);

        process_init(cui, cui->waitset, false);

        /* Loop here for scripts that just started the server. */

retry_start:
        for (i = start_daemon ? 2 : 15; i && timeout; i--) {
                cui->client = discover_client_init(cui->waitset,
                                &cui_client_ops, cui);
                if (cui->client || !i)
                        break;
                pb_log_fn("waiting for server %d\n", i);
                sleep(1);
        }

        if (!cui->client && start_daemon) {
                int result;

                start_daemon = 0;

                result = pb_start_daemon(cui);

                if (!result)
                        goto retry_start;

                pb_log_fn("discover_client_init failed.\n");
                fprintf(stderr, _("%s: error: discover_client_init failed.\n"),
                        __func__);
                fprintf(stderr, _("could not start pb-discover, the petitboot "
                        "daemon.\n"));
                goto fail_client_init;
        }

        if (!cui->client && !timeout) {
                /* Have the first timeout fire immediately so we can check
                 * for the server as soon as the UI is ready */
                waiter_register_timeout(cui->waitset, 0,
                                        cui_server_wait, cui);
        } else if (!cui->client) {
                pb_log_fn("discover_client_init failed.\n");
                fprintf(stderr, _("%s: error: discover_client_init failed.\n"),
                        __func__);
                fprintf(stderr, _("check that pb-discover, "
                        "the petitboot daemon is running.\n"));
                goto fail_client_init;
        }

        atexit(cui_atexit);
        talloc_steal(cui, cui->client);
        cui_start();

        cui->main = main_menu_init(cui);
        if (!cui->main)
                goto fail_client_init;

        cui->plugin_menu = plugin_menu_init(cui);
        if (!cui->plugin_menu)
                goto fail_client_init;

        waiter_register_io(cui->waitset, STDIN_FILENO, WAIT_IN,
                        cui_process_key, cui);

        if (js_map) {

                cui->pjs = pjs_init(cui, js_map);

                if (cui->pjs)
                        waiter_register_io(cui->waitset, pjs_get_fd(cui->pjs),
                                        WAIT_IN, cui_process_js, cui);
        }

        return cui;

fail_client_init:
        talloc_free(cui);
fail_alloc:
        return NULL;
}

/**
 * cui_cancel_autoboot_on_exit - On exit spin until the server is available.
 *
 * If the program exits before connecting to the server autoboot won't be
 * cancelled even though there has been keyboard activity. A child is forked
 * which will spin until the server is connected and told to cancel autoboot.
 */
static void cui_cancel_autoboot_on_exit(struct cui *cui)
{
        pid_t pid;

        if (!cui->client) {
                /* Fork a child to tell the server to cancel autoboot */
                pid = fork();
                if (!pid) {
                        cui_detached = true;

                        /* Loop until connection established */
                        while (!cui->client) {
                                cui->client = discover_client_init(cui->waitset,
                                                &cui_client_ops, cui);
                                if (!cui->client)
                                        sleep(1);
                        }

                        talloc_steal(cui, cui->client);
                        discover_client_cancel_default(cui->client);
                        exit(EXIT_SUCCESS);
                }
                if (pid < 0)
                        pb_log("Failed to fork child on exit: %m\n");
        } else
                discover_client_cancel_default(cui->client);
}

/**
 * cui_run - The main cui program loop.
 * @cui: The cui instance.
 * @main: The menu to use as the main menu.
 *
 * Runs the cui engine.  Does not return until indicated to do so by some
 * user action, or an error occurs.  Frees the cui object on return.
 * Returns 0 on success (return to shell), -1 on error (should restart).
 */

int cui_run(struct cui *cui)
{
        assert(cui);
        assert(cui->main);

        cui->current = &cui->main->scr;
        cui->default_item = 0;

        nc_scr_post(cui->current);

        while (1) {
                int result = waiter_poll(cui->waitset);

                if (result < 0) {
                        pb_log_fn("poll: %s\n", strerror(errno));
                        break;
                }

                if (cui->abort)
                        break;

                while (cui->resize) {
                        cui->resize = 0;
                        cui_handle_resize(cui);
                }
        }

        cui_cancel_autoboot_on_exit(cui);

        cui_atexit();

        return cui->abort ? 0 : -1;
}